Since state area alone doesn't produce anything (maybe it's a rough indicator for general access to share of natural resources, but that's not relevant here) T

Since state area alone doesn't produce anything (maybe it's a rough indicator for general access to share of natural resources, but that's not relevant here) The comparison could be done on province level though. If you add up Jiangxi and Fujian Province you would end up with roughly the same are and population as Germany with a slightly higher density.